I started from the beginning.
I am now back at the door on the 26th level I put four gold keys but nothing happened. The door remains closed.
Edit: I look at the nexus and there is again a newer version. So give it a try.
Edit 2: version 154. The door remains closed
Edit 3:
Resu wrote:
2. to get to Dimension-X you have to find 3 Altars in the Ritual Temple and solve the puzzle to open a portal
where there are three altars in the LV26?
I can not find them.
There are two closed the door. One locked. But I do not have a key. I got these keys (brass, gold, master, ornate, iron, prison). Not one the door open.
The second door is closed at the bottom of the map.